| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0CF | 101 | 25.83 % | | 135 | 28.36 % | | 2 | C D C C C | K0PIR | 98 | 25.06 % | | 116 | 24.37 % | | 3 | C C D C | AA3B | 65 | 16.62 % | | 76 | 15.97 % | | 4 | C C D C C | AA0AW | 65 | 16.62 % | | 81 | 17.02 % | | 5 | C C D C C C | JH7RTQ | 56 | 14.32 % | | 61 | 12.82 % | | 6 | C D C C C / D | K3RWN/4 | 2 | 0.51 % | | 3 | 0.63 % | | 7 | D C D C C | 4U1WB | 1 | 0.26 % | | 1 | 0.21 % | | 8 | C C D C C / C D | KH6CN/W7 | 1 | 0.26 % | | 1 | 0.21 % | | 9 | C C D C / D | NE8O/4 | 1 | 0.26 % | | 1 | 0.21 % | | 10 | C D C | W0A | 1 | 0.26 % | | 1 | 0.21 % | |
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